time for decommission a data node

Hi , I am planning to decommission a data node , is there any formula that can be used to estimate time it takes to decomission a node based on size per say the data that is there on my decommission node is around 1TB or datanode balancing Bandwidth ,Replication Work Multiplier Per Iteration ?.

As mentioned earlier, you can monitor this from CM -> HDFS -> WebUI -> Namenode Web UI -> a new window will open, 'Datanodes' menu -> scroll down to Decommissioning (keep refresh this page to get the progress)

If your answer is yes for my above question, then I got the similar issues few times and I've over come this issue as follows: